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When we look back on Alex Song's career so far, it seems self-evident that his seven-year spell at Arsenal was more productive than his subsequent stint at Barcelona.

While Song established himself as first-choice defensive midfielder in North London, he was far from a regular at the Nou Camp. After making a handful of appearances over two seasons and being voted one of the worst signings of the 2012/13La Liga season, he was unceremoniously packed off to West Ham on loan.

Still, there's no hard feelings as far as Song's concerned. In fact, he seems far fonder of the Catalan club than its English counterpart - as evidenced by his celebrations after Barca's 2-0 Champions League win over Arsenal last night.

As you can see above, the former Gunner had no qualms about hanging out with Neymar, Dani Alves and co. after the big match. He was so pleased with their victory, he visited the away dressing room at the final whistle and celebrated with Barca's star men - filming the whole thing and then putting it on Snapchat.

If that seems like serious fan boy behaviour on Song's part, well, that's because it is. He even appears to have collected a load of Barca shirts as souvenirs.

Unsurprisingly, Arsenal fans don't seem best pleased.

This isn't the most diplomatic move from Song, in fairness. We can understand why people are annoyed.

Still, Arsenal fans can take solace in the fact that Barca paid £15million to sign him. Top transfer trolling, that.